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Published in: BioPsychoSocial Medicine 1/2010

Open Access 01-12-2010 | Research

Decreased response inhibition in middle-aged male patients with type 2 diabetes

Authors: Kaya T Ishizawa, Hiroaki Kumano, Atsushi Sato, Hiroshi Sakura, Yasuhiko Iwamoto

Published in: BioPsychoSocial Medicine | Issue 1/2010

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Abstract

Background

This study was performed to examine whether patients with type 2 diabetes have cognitive deficits associated with the prefrontal cortex (PFC).

Methods

Twenty-seven middle-aged patients with newly diagnosed type 2 diabetes and 27 healthy controls underwent physical measurements and neuropsychological tasks. Response inhibition, reward prediction, and executive function were assessed by the Go/NoGo task, the reversal and extinction tasks, and the Wisconsin Card Sorting Test (WCST). To examine the interactions of being overweight with diabetes on cognitive performance, performance data were analysed by two-way ANCOVA with diabetes and overweight as factors and age as a covariate.

Results

Patients with type 2 diabetes showed significantly decreased response inhibition in the Go/NoGo task (discriminability index: P = 0.001). There was an interaction of being overweight with diabetes on reaction time in the Go trials of the Go/NoGo task (P = 0.009). Being overweight was related to retained responses to the presentiment of reward in the extinction task (P = 0.029). The four groups showed normal cognitive performance in the WCST.

Conclusions

Our results showed that middle-aged, newly diagnosed and medication-free patients with type 2 diabetes have a particular neuropsychological deficit in inhibitory control of impulsive response, which is an independent effect of diabetes apart from being overweight.
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Metadata
Title
Decreased response inhibition in middle-aged male patients with type 2 diabetes
Authors
Kaya T Ishizawa
Hiroaki Kumano
Atsushi Sato
Hiroshi Sakura
Yasuhiko Iwamoto
Publication date
01-12-2010
Publisher
BioMed Central
Published in
BioPsychoSocial Medicine / Issue 1/2010
Electronic ISSN: 1751-0759
DOI
https://doi.org/10.1186/1751-0759-4-1

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